焊接止回閥概述：
永嘉信茂閥門有限公司生產的焊接止回閥是能自動阻止流體倒流的閥門。止回閥的閥瓣在流體壓力作用下開啟，流體從進口側流向出口側。當進口側壓力低于出口側時，閥瓣在流體壓差、本身重力等因素作用下自動關閉以防止流體倒流。
止回閥一般分為升降式、旋啟式等幾種類型。
升降式止回閥的結構一般與截止閥相似，其閥瓣沿著通道中心線作升降運動，動作可靠，但流體阻力較大，適用于較小口徑的場合。升降式止回閥可分為直通式和立式兩種。直通式升降式止回閥一般只能安裝在水平管路，而立式升降止回閥一般應安裝在垂直管路。
旋啟式止回閥的閥瓣繞轉軸作旋轉運動。其流體阻力一般小于升降式止回閥，它適用于較大口徑的場合。旋啟式止回閥根據閥瓣的數目可分為單瓣旋啟式、雙瓣旋啟式及多瓣旋啟式三種。單瓣旋啟式止回閥一般適用于中等口徑的場合。大口徑管路選用單瓣旋啟式止回閥時，為減少水錘壓力，采用能減小水錘壓力的緩閉止回閥。雙瓣旋啟式止回閥適用于大中口徑管路。對夾雙瓣旋啟式止回閥結構小、重量輕，是一種發展較快的止回閥；多瓣旋啟式止回閥適用于大口徑管道路。
主要零件材料及性能規
| 主 要 零 部 件 | 閥體、閥蓋、搖桿 | WCB | CF8 | CF8M | WC6、WC9 |
| 閥瓣 | WCB堆Cr13或硬質合金 | CF8堆硬質合金 | CF8M堆硬質合金 | WC6、WC9堆硬質合金 | |
| 閥座 | 25堆Cr13或硬質合金 | 304堆硬質合金 | 316堆硬質合金 | 20Cr1MoV堆硬質合金 | |
| 墊片 | 軟鐵、XB450 | 聚四氟乙烯 | 聚四氟乙烯 | 不銹鋼+耐酸石棉纏繞墊 | |
| 螺栓 | 35CrMoA | 35CrMoA | 35CrMoA | 25Cr1Mo1V | |
| 螺母 | 45 | 45 | 45 | 35CrMoA | |
| 主要參數 | 適用介質 | 油品、水、蒸汽 | 硝酸類 | 醋酸類 | 油品、水、蒸汽 |
| 適用溫度 ℃ | ≤425 | ≤200 | ≤200 | ≤550 |
主要連接尺寸：
| 型號 | 公稱 通徑 NPS(in) | 壓力級 Class | 主要結構尺寸(mm) | 閥體 材料 | 性能規范 | |||||
| D | D1 | L | L1 | H | 適用溫度(℃) | 適用介質 | ||||
| SFH | 2" | 150 | | | 203 | | 170 | WCB | ≤425 | 水、油品、蒸氣等 |
| " | 3" | " | | | 241 | | 185 | " | " | " |
| " | 4" | " | | | 292 | | 215 | " | " | " |
| " | 6" | " | | | 356 | | 260 | " | " | " |
| " | 8" | " | | | 495 | | 300 | " | " | " |
| " | 10" | " | | | 622 | | 350 | " | " | " |
| " | 12" | " | | | 699 | | 400 | " | " | " |
| " | 14" | " | | | 787 | | 450 | " | " | " |
| " | 16" | " | | | 864 | | 480 | " | " | " |
| " | 18" | " | | | 978 | | 540 | " | " | " |
| " | 20" | " | | | 978 | | 600 | " | " | " |
| " | 24" | " | | | 1295 | | 680 | " | " | " |
| SFH | 2" | 300 | | | 267 | | 170 | WCB | ≤425 | 水、油品、蒸氣等 |
| " | 3" | " | | | 318 | | 215 | " | " | " |
| " | 4" | " | | | 356 | | 235 | " | " | " |
| " | 6" | " | | | 445 | | 300 | " | " | " |
| " | 8" | " | | | 533 | | 340 | " | " | " |
| " | 10" | " | | | 622 | | 350 | " | " | " |
| " | 12" | " | | | 711 | | 420 | " | " | " |
| " | 14" | " | | | 838 | | 480 | " | " | " |
| " | 16" | " | | | 864 | | 520 | " | " | " |
| " | 18" | " | | | 978 | | 600 | " | " | " |
| " | 20" | " | | | 1016 | | 670 | " | " | " |
| " | 24" | " | | | 1346 | | 750 | " | " | " |
| SFH | 2" | 600 | | | 292 | | 175 | WCB | ≤425 | 水、油品、蒸氣 |
| " | 3" | " | | | 356 | | 230 | " | " | " |
| " | 4" | " | | | 432 | | 295 | " | " | " |
| " | 6" | " | | | 559 | | 360 | " | " | " |
| " | 8" | " | | | 660 | | 400 | " | " | " |
| " | 10" | " | | | 787 | | 460 | " | " | " |
| " | 12" | " | | | 838 | | 520 | " | " | " |
| " | 14" | " | | | 889 | | 560 | " | " | " |
| " | 16" | " | | | 991 | | 650 | " | " | " |
| " | 18" | " | | | 1092 | | 730 | " | " | " |
| " | 20" | " | | | 1194 | | 800 | " | " | " |
| " | 24" | " | | | 1397 | | 900 | " | " | " |
訂貨須知：
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